I have three related questions on Google Answers right now. I think
these issues are likely to be trivial for anyone with a solid working
knowledge of web programming; I am pretty much a neophyte.

Sometimes I want students (I am a teacher; my site users are all my
students) to be able to enter some text into a text field and then see
it display further down the page. I use a basic form along with this
code:

<input type="button" value="Submit"
onClick="document.all.position2.innerHTML = document.all.position.value">

where "position" is the name of the text field, and a tag further down
in the document says <font id="position2".

But if I want the same text to show up multiple times in the document,
it looks like this:

<input type="button" value="Submit"
onClick="document.all.position2.innerHTML =
document.all.position.value, document.all.position3.innerHTML =
document.all.position.value, document.all.position4.innerHTML =
document.all.position.value,
document.all.position5.innerHTML = document.all.position.value,
document.all.position6.innerHTML = document.all.position.value ">

Then I've been using a different font id tag every time I want the
text to display. There must be a better, simpler way. How can I clean
this up so that I can use the same tag every time I want this text to
be displayed later in the document? Is it possible?

Informed comments welcome!

Why not put your code in a <script> tag anyway... you can simply call
the function in the onchange or onblur method and let the script
handle the semantics.

I think there is a way to do a loop through appropriate types of content.
This: http://pietschsoft.com/Blog/Post.aspx?PostID=1303
lists through all elements.
It would be reasonable to use a case or if construct to determine if
you need to update...
http://jennifermadden.com/javascript/loopForms.html tells you how to
check through elements.

But... you should be able to do document.FormName.Fieldname.value=value
http://bton.com/tb16/jsref/array.html another suggestion.

PS... if you're using FireFox and would like some "help" on clicking
these urls, I understand URL Link
https://addons.mozilla.org/firefox/403/ is a good option.